Galaxies, groups and clusters towards lensed quasars

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Galaxies, groups and clusters towards lensed
quasars

• Cécile Faure (PUC)
• Danielle Alloin (ESO)
• Jean-Paul Kneib (Marseille)
• Frédéric Courbin (Lausanne)

Impact of Gravitational Lensing in Cosmology,
July 20th, 2004
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Plan of the talk1. Introduction2. Lens
sample3. Dataset4. Method5. Main results6.
Conclusion
Impact of Gravitational Lensing in Cosmology,
July 20th, 2004
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1. Introduction
This work Sample of 10 lensed quasars for
which we have mapped the mass distribution in a
field of 7x7 around the quasar
images Immediate objective Reduce systematic
errors while modeling lensed quasars, by looking
for all elements of the lens searching for
physical sources of shear other than the main
lensing galaxy (external shear) Final goal 1)
Perform more accurate models of the lensing
potential, in order to derive Ho on a
cosmological scale (from systems with known time
delay) 2) Study the mass distribution (bright
and dark) in the Universe
Impact of Gravitational Lensing in Cosmology,
July 20th, 2004
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1. Introduction
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2. Lens sample
SBS 1520530 double z1.85
external shear H1413117 quadruple
z2.55 external shear B1030074
double z1.54 external
shear HE1104-1805 double z2.32
external shear B1359154 sextuple
z3.23 external shear HE2149-2745
double z2.03 external shear
LBQS1009-0252 double z 2.74
external shear CTQ414 double
z1.29 never modeled HE0230-2130
quadruple z2.16 never
modeled LBQS1429-0053 lens or binary quasar?
z1.85 Faure et al. 2002, Faure et al. 2003,
AA Faure et al. 2004-a, AA Faure et al. 2004-b,
Courbin et al. 2004, in prep.
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3. Dataset
VLT ISAAC (2.5x2.5) 30h (J, Ks) FORS1
(6.8x6.8) 10h (R) HST WFPC2 (F555w, F814w)
et NICMOS-2 (F160w) NOT AlFOSC (R) et HiRAC (V,
R, I)
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July 20th, 2004
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4. Method
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4. Method
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4. Method
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4. Method
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4. Method
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4. Method
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5. Results SBS1520530
Faure et al. 2002, Burud et al. 2002
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5. Results SBS1520530
Galaxy overdensity at z0.9 /- 0.1
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5. Results SBS1520530
Time delay 130 /- 3 days Flux ratio
MB-MA0.83 (continuum) to 1.44 (emission
lines)

Ho 51
/- 9km s-1 Mpc -1 Last results from lensed
quasar with time-delay Kochanek Schechter 2003
Ho48 /- 3 km s-1 Mpc- 1
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5. ResultsLBQS1429-0053
Faure et al. 2003 Similar spectra, same redshift
(z2.07) Angular separation 5.1

• Deconvolution (R, J, K)
• No bright galaxy until R27, J24, Ks22.5
• No galaxy overdensity in a field of 7x7 around
  the quasars

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5. Results LBQS1429-0053
- No correlation in the weak-shear map No
massive potential in the FORS1 field-of
view Conclusions There is no bright lensing
potential (galaxy or group) towards the
quasars There is no structures more massive than
M10 13 Msol in the field If it is a lensed
quasar the lensing galaxy is dark, and it is
extremly massive (sv350 km s-1) Most probably
genuine binary quasar
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5. Results Faure et al. 2004
- Einstein ring, primary lensing galaxy,
secondary galaxy - Photometric redshifts
Impact of Gravitational Lensing in Cosmology,
July 20th, 2004
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5. Results Faure et al. 2004

• Galaxy overdensities (R and Ks band)
• Photometric redshifts

Impact of Gravitational Lensing in Cosmology,
July 20th, 2004
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5. Results Faure et al. 2004

• Galaxy overdensities (R and Ks band)
• Photometric redshifts

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July 20th, 2004
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5. Results Faure et al. 2004
CL00241654 H1413117
LBQS1429-0053 1015 Msol
1014 Msol
1013 Msol

• Weak shear analysis
• Mass reconstruction
• Kneib et al. 2003

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July 20th, 2004
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5. Results Faure et al. 2004
Former studies
Induced by the groups Mass(lt500kpc)
Ext. g PAg(deg) g
PAg (deg) 1014 Msol CTQ 414 /
/ lt0.19
24 lt2.0 HE0230
/ / 0.07
45 4.0 LBQS1009 0.05
-36 No galaxy group found
/ B1030 0.09 -39 No
galaxy group found / HE1104
0.05 -38 /
90 / B1359 0.12/0.26
71/97 lt0.03 -12
lt11.0 H1413 0.08 70
lt0.16 45
lt2.0 HE2149 gt0.21 58
0.27 45 3.0

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6. Conclusion
3 directions of research -
spatial galaxy number overdensity
- velocity photometric redshifts -
potential well weak-shear analysis Discrepancy
between the shear value predicted by modeling and
the observational results Galaxy group masses
are estimations, therefore, a first step for the
modeling Lensed quasars with time delay lead to
low value of Ho.
Impact of Gravitational Lensing in Cosmology,
July 20th, 2004